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Separate scientific studies of smoking and testosterone provide different results some show no effect, some show higher testosterone levels in smokers, and others show the opposite

Retrieved 3 January 2018

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Freud: A Life for Our Time

The signs of nicotine addiction are strong cravings for tobacco products or nicotine, tolerance requiring more nicotine to achieve the same effect, irritability or anxiety when unable to access nicotine, difficulty quitting or unsuccessful attempts to stop using tobacco, increased use of nicotine over time, withdrawal symptoms such as headaches, fatigue, or mood swings, and continued use despite health problems related to smoking or nicotine use

We already know that nicotine has a damaging effect on developing brains, rewiring them for further addiction